Should have changed it when we did Dave (late 60s-early 70s)....By now, half the people that didn't or wouldn't understand would be dead......in 30 more years, the rest of us will go.......Yippee, we are half way there........

Yeah I know. Even NY tried it on the interstates Km, Kph and MPH on the speed and distance signs - and finally gave up as too confusing tho mileage (and even some Franglish) has stayed posted for the Quebecois on I-87 North of Exit 30/31 .